Question
A cone has a circular base, a perpendicular height equal to 21cm, and a semi-vertical angle of 30degrees. Calculate the slant height of the cone. Find the area of its base.(take pie to be 22/7)
Answers
if the slant height is s,
21/s = cos 30°
similarly, the radius r of the base is
r/21 = tan 30°
and, naturally, the area of the base
a = <b>pi</b> r^2
21/s = cos 30°
similarly, the radius r of the base is
r/21 = tan 30°
and, naturally, the area of the base
a = <b>pi</b> r^2
Pi r^2
solve it complete